/* Copyright (c) 2010, Carl Burch. License information is located in the
 * com.cburch.logisim.Main source code and at www.cburch.com/logisim/. */

package com.cburch.logisim.circuit;

import java.awt.Color;
import java.awt.Graphics;
import java.awt.event.MouseEvent;

import com.cburch.logisim.data.Bounds;
import com.cburch.logisim.gui.main.Canvas;
import com.cburch.logisim.instance.InstancePainter;
import com.cburch.logisim.instance.InstancePoker;
import com.cburch.logisim.instance.InstanceState;

public class SubcircuitPoker extends InstancePoker {

    private static final Color MAGNIFYING_INTERIOR = new Color(200, 200, 255, 64);
    private static final Color MAGNIFYING_INTERIOR_DOWN = new Color(128, 128, 255, 192);

    private boolean mouseDown;

    @Override
    public Bounds getBounds(InstancePainter painter) {
        Bounds bds = painter.getInstance().getBounds();
        int cx = bds.getX() + bds.getWidth() / 2;
        int cy = bds.getY() + bds.getHeight() / 2;
        return Bounds.create(cx - 5, cy - 5, 15, 15);
    }

    @Override
    public void paint(InstancePainter painter) {
        if (painter.getDestination() instanceof Canvas
                && painter.getData() instanceof CircuitState) {
            Bounds bds = painter.getInstance().getBounds();
            int cx = bds.getX() + bds.getWidth() / 2;
            int cy = bds.getY() + bds.getHeight() / 2;

            int tx = cx + 3;
            int ty = cy + 3;
            int[] xp = { tx - 1, cx + 8, cx + 10, tx + 1 };
            int[] yp = { ty + 1, cy + 10, cy + 8, ty - 1 };
            Graphics g = painter.getGraphics();
            if (mouseDown) {
                g.setColor(MAGNIFYING_INTERIOR_DOWN);
            } else {
                g.setColor(MAGNIFYING_INTERIOR);
            }
            g.fillOval(cx - 5, cy - 5, 10, 10);
            g.setColor(Color.BLACK);
            g.drawOval(cx - 5, cy - 5, 10, 10);
            g.fillPolygon(xp, yp, xp.length);
        }
    }

    @Override
    public void mousePressed(InstanceState state, MouseEvent e) {
        if (isWithin(state, e)) {
            mouseDown = true;
            state.getInstance().fireInvalidated();
        }
    }

    @Override
    public void mouseReleased(InstanceState state, MouseEvent e) {
        if (mouseDown) {
            mouseDown = false;
            Object sub = state.getData();
            if (e.getClickCount() == 2 && isWithin(state, e)
                    && sub instanceof CircuitState) {
                state.getProject().setCircuitState((CircuitState) sub);
            } else {
                state.getInstance().fireInvalidated();
            }
        }
    }

    private boolean isWithin(InstanceState state, MouseEvent e) {
        Bounds bds = state.getInstance().getBounds();
        int cx = bds.getX() + bds.getWidth() / 2;
        int cy = bds.getY() + bds.getHeight() / 2;
        int dx = e.getX() - cx;
        int dy = e.getY() - cy;
        return dx * dx + dy * dy <= 60;
    }
}
